Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 9: Transport: Nanoelectronics III - Molecular Electronics

TT 9.6: Vortrag

Montag, 27. März 2006, 15:15–15:30, HSZ 304

Electron transport in bundles of metallic single-walled carbon nanotubes — •Christoph Wolfgang Marquardt¹, Frank Hennrich¹, Hilbert v. Löhneysen^2,3, and Ralph Krupke¹ — ¹Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe, Germany — ²Universität Karlsruhe, Physikalisches Institut, 76128 Karlsruhe, Germany — ³Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany

Concerning the electronic transport properties, an individual metallic single-walled carbon nanotube (SWNT) has been described as a Luttinger liquid system (LL). This regime can describe the power law behaviour found in the temperature dependent conductance, as well as in the voltage dependent differential conductance [1]. In heterogeneous bundles of SWNTs, that are composite bundles of metallic and semiconducting tubes, similar power law behaviour has been observed [2], which implies, that the metallic tubes in a heterogeneous bundle are well decoupled from each other by the semiconducting nanotube matrix. During the fabrication of carbon nanotubes both metallic and semiconducting ones are produced. Using dielectrophoresis as method to separate these types [3], we are able to prepare samples of bundles of exclusively metallic SWNTs, i.e. without the semiconducting nanotube matrix. Here we present measurements of the transport characteristics of such samples, that show obvious deviation from the LL behaviour.

[1] M. Bockrath et al., Nature 397 (1999) 598 [2] R. Krupke et al., Nano Lett. 3 (2003) 1019 [3] R. Krupke et al., Science 301 (2003) 344